l seymour



E. fL- SEYMOUR.

Ore Separator.

Patented Auga 14, 1855.l

bwss es:

UNITED STATES PATENT OFFICE.

EDWD. L. SEYMOUR, OF NEW YORK, N. Y., ASSIG-NOR 'lO YV. O. BOURNE.

APPARATUS FOR SIFTING.

Specification of Letters Patent No. 13,449; dated August 14, 1855.

To all whom, t may concern Be it known that I, EDWARD LoUIs SEY- MOUR, of the city and State of New York, chemist, have invented a new and useful Apparat-us or Machine for Sifting; and I hereby declare that the following is a full, clear, and exact description of the construct-ion and operation of the same, reference being had to the annexed drawings, making part of this specification.

My invention and improvement consist, first, in the peculiar arrangement and construction of a cylindrical sifting apparatus, for metallurgical and other purposes, which I call the compound tubular rotary sifter,

consisting as it does of two, three, four, five or more cylindrical or tubular sieves of various dimensions, placed one within the other, and so contrived as to be capable of being easily set into a rotary motion around one common center or axis; and while thus rotating, as one body, to sift out, in one and the same operation, and wit-hin a very narrow compass, any desirable number of different sizes, with the greatest po-ssible rapidity; combining, therefore, every possible advantage and facility, in all such technical manipulations or processes, in which large quantities of ore, rock, minerals or mineral earths, sands, gravels, &c., grain or powder of any description or nature have to be sifted and subdivided into a variety of corresponding sizes of their respective atoms parts or particles. The first or center-sieve being the coarsest; and the last or outermost being the finest, the sifting out of all the sizes required is performed from the center of the apparatus toward its surfaces, that is, from the coarsest to the finest. Secondly, in the peculiar construction and arrangement of the frames or skeletons, around which the sieve-cloths have to be spread and fastened. Such frame or skeleton I call the compound helicoidal frame. I make it of a series of metallic rods or strips, wire or any other convenient material, so contrived as to present a series of equidistant helicoidal surfaces within each of the tubular sieves and receptacles; making the planes of such helicoidal surfaces the more incline toward the one center common to all, the greater the diameter of their respective tubular sieves and receptacles, a set of which, when placed one within the other, and attached to a common rod or axis around which to rotate; or with any other convenient inode capable of producing the same rotary motion, const-itute, as aforesaid, my compound tubular rotary sifter.

The object of the compound helicoidal frame is to make the parts, particles or atoms of the ore or matter being sifted, spread most uniformly; and travel the faster over the surfaces of their respective sieves and discharging tubes or receptacles, the larger the space they have to go through.

On reference to the accompanying drawings the mode of constructing a f compound tubular rotary sifter, intended for four different sizes, will be easily understood.

Figures l, 2, 3, and t represent the compound helical frames; the space between X and Z in Figs. l, 2,' and 3 to be covered with sieve-cloth of desirable meshes or numbers; the coarsest, as a matter of course, for the first or center sieve; the finest for the third, or, if a greater number of sieves be used, for whichever is the last or outermost sieve; the remaining surface of the frames to be covered with sheet iron, or any other convenient material, to form in each sieve a tubular receptacle, or rather, discharging conduits. The spaces covered with sievecloth are to be longer on each frame from the inner to the outermost; that is to say, the outer sieves require a greater length of sifting surface, so as to prevent any portion of the stuff which falls, during the process, from one sieve into the other, to be discharged unsifted; while the tubes or discharging pipes have inverse lengths, for the purpose of delivering each size separately. Fig. 4, is to be entirely surrounded with sheets of metal (or other material answering the purpose) forming the last tubular receptacle or conduit, and discharging the last or finest size.

Then the Various sieves are put together for working, viz., one over the other, they are kept in their positions by means of screws, bolts or pins, uniting their respective flanges, at one end; while, at the other end,

the proper spaces between the tubular disthe other provided With conduits, so archarging pipes or conduits of the respecj ranged as to deliver the proceeds continutives sieves can be regulated and maintained ously substantially as described. by means of pins, Wedges or otherwise. E. LOUIS SEYMOUR.

5 Vhat I claim as my invention in the above VitneSses:

described rotary sitter is- DANL. B. BROWN,

The several cylindrical sleves one Within WM. ORLAND BROWN. 

